In what region were these factors prevalent in the years leading up to the civil war? a) the north b) the south c) the frontier d) the great plains

The South is the correct answer

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

the answer is states.